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Finding the Fourth Proportional to 766.85, 1,149.75 and 419.90

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Solution

The fourth proportional to 766.85, 1,149.75 and 419.90 is: 629.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.85 : 1,149.75 = 419.90 : x
  2. Step 2: Convert to fraction form
    766.85/1,149.75 = 419.90/x
  3. Step 3: Cross multiply
    766.85x = 1,149.75 × 419.90
  4. Step 4: Simplify right side
    766.85x = 482,774.28
  5. Step 5: Solve for x
    x = 482,774.28/766.85
  6. Step 6: Final answer
    x = 629.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.